#include<cstdio>
#include<cmath>
const double pi=3.1415926;
int main()
{
	float r,c,s;
	printf("r=");
	scanf("%f",&r);
	c=2*pi*r;
	s=pi*pow(r,2);
	printf("C=%.2f,S=%.2f\n",2*pi*r,pi*pow(r,2));                              
}